US Bridges

Caa Road over Flat Rock Creek

Fair

Marquette County, Michigan · 5 MI SW of S End of 581 H · Structure no. 000000000006578

Built
1936
89 years old, rebuilt 1989
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
51 ft
1 main span
Daily traffic
55
2001 count
Owner
County
County Highway Agency

About this bridge

Caa Road over Flat Rock Creek is a steel stringer/multi-beam or girder carrying Caa Road over Flat Rock Creek in Marquette County, Michigan. It was built in 1936 and reconstructed in 1989, so it is 89 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 55 vehicles a day, projected to reach 75 by 2020. The structure is 51 ft (15.5 m) long and 16 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesCaa Road
CrossesFlat Rock Creek
Location5 MI SW of S End of 581 H
RouteCounty Highway 0
CountyMarquette County
StateMichigan
Coordinates46.2801, -87.85595
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating107.1 US tons
Inventory rating88.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length51 ft (15.5 m)
Longest span42 ft (12.8 m)
Deck width16 ft (5 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (2001)
Projected traffic75 by 2020
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Caa Road over Flat Rock Creek built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1989.

What condition is Caa Road over Flat Rock Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does Caa Road over Flat Rock Creek carry?

About 55 vehicles per day (2001 count).

How long is Caa Road over Flat Rock Creek?

The structure is 51 ft (15.5 m) long with a longest span of 42 ft (12.8 m) and a deck 16 ft wide.

Who owns Caa Road over Flat Rock Creek?

It is owned by the County Highway Agency.